A025 Brush Length Too Short; A026 Poor Bearing Condition; A027 Air Flow Monitoring; A031 Speed Controller Monitoring - Siemens 6RA70 Series Instructions Manual

Alarm
No.
A025 Brush length too short
(active in all operating states)
When parameter P495=1 (binary sensing of brush length):
Alarm in response to log. "0" signal (longer than 10s) at terminal 211
Possible causes
♦ Encoder for brush length has responded
♦ Interruption in encoder cable
A026 Poor bearing condition
(active in all operating states)
When parameter P496=1 (bearing condition sensing):
Alarm in response to log. "0" signal (longer than 2s) at terminal 212
Possible causes
♦ Encoder for bearing condition has responded
A027 Air flow monitoring
(active in operating states of < o6)
When parameter P497=1 (air flow monitoring):
Alarm in response to log. "0" signal (longer than 40s) at terminal 213
Possible causes
♦ Encoder for fan monitoring has responded
♦ Interruption in encoder cable
A028 Motor overtemperature
(active in all operating states)
When parameter P498=1 (thermostat connected):
Alarm in response to log. "0" signal (longer than 10s) at terminal 214
Possible causes
♦ Thermostat for monitoring motor temperature has responded
♦ Interruption in encoder cable
A029 Motor overtemperature
(active in all operating states)
Selection via P493=1 or 3 (thermostat at terminals 22 / 23) or
P494=1 or 3 (thermostat at terminals 204 / 205)
When parameter P490.01=1 (KTY84 at terminals 22 / 23) or P490.02=1 (KTY84 at terminals 204 / 205):
The alarm is activated if the motor temperature reaches or exceeds the values set in parameter P492.
When parameter P490.01=2, 3, 4 or 5 (PTC thermistor at terminals 22 / 23) or P490.02=2, 3, 4 or 5 (PTC thermistor at terminals
204 / 205):
The alarm is activated if the motor temperature reaches or exceeds the trip value of the selected PTC.
A030 Commutation failure or overcurrent has occurred
(active in operating states of – –, I, II)
Possible error causes
♦ Mains voltage dip in regenerative feedback mode
♦ Current control loop not optimized
A031 Speed controller monitoring
(active in operating states of – –, I, II)
The monitor responds when the difference between the connectors selected in P590 and P591 (factory setting: Setpoint/actual
value difference of speed controller) exceeds the limit set in parameter P388 for longer than the time set in parameter P390.
Possible causes
♦ Control loop interrupted
♦ Controller is not optimized
♦ P590 or P591 is not correctly parameterized
Siemens Energy & Automation
SIMOREG DC Master Base Drive Panel Operating Instructions
Description
9-29